The Twilio team has scaled their infrastructure and organization from 3 employees to over 70 in just three years, expanding services beyond phone calls to include long code SMS, browser VoIP, mobile VoIP, conferencing, transcription, presence, and app billing. The company has also seen a significant increase in traffic, scaling server infrastructure from a few servers to hundreds running in the cloud using technologies such as PHP, Python, Twisted/gevent, Java, Asterisk/FreeSwitch/JSR289, MySQL, and Redis. To achieve this growth, the team emphasizes core engineering cultural values like simplicity, automation, shipping, empiricism, and humbleness, which have enabled data-based decision making and continuous improvement.